mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-27 11:15:39 +00:00
86 lines
2.8 KiB
Go
86 lines
2.8 KiB
Go
// Copyright (c) 2021 Tulir Asokan
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
// Package appstate implements encoding and decoding WhatsApp's app state patches.
|
|
package appstate
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"sync"
|
|
|
|
"go.mau.fi/whatsmeow/store"
|
|
"go.mau.fi/whatsmeow/util/hkdfutil"
|
|
waLog "go.mau.fi/whatsmeow/util/log"
|
|
)
|
|
|
|
// WAPatchName represents a type of app state patch.
|
|
type WAPatchName string
|
|
|
|
const (
|
|
// WAPatchCriticalBlock contains the user's settings like push name and locale.
|
|
WAPatchCriticalBlock WAPatchName = "critical_block"
|
|
// WAPatchCriticalUnblockLow contains the user's contact list.
|
|
WAPatchCriticalUnblockLow WAPatchName = "critical_unblock_low"
|
|
// WAPatchRegularLow contains some local chat settings like pin, archive status, and the setting of whether to unarchive chats when messages come in.
|
|
WAPatchRegularLow WAPatchName = "regular_low"
|
|
// WAPatchRegularHigh contains more local chat settings like mute status and starred messages.
|
|
WAPatchRegularHigh WAPatchName = "regular_high"
|
|
// WAPatchRegular contains protocol info about app state patches like key expiration.
|
|
WAPatchRegular WAPatchName = "regular"
|
|
)
|
|
|
|
// AllPatchNames contains all currently known patch state names.
|
|
var AllPatchNames = [...]WAPatchName{WAPatchCriticalBlock, WAPatchCriticalUnblockLow, WAPatchRegularHigh, WAPatchRegular, WAPatchRegularLow}
|
|
|
|
type Processor struct {
|
|
keyCache map[string]ExpandedAppStateKeys
|
|
keyCacheLock sync.Mutex
|
|
Store *store.Device
|
|
Log waLog.Logger
|
|
}
|
|
|
|
func NewProcessor(store *store.Device, log waLog.Logger) *Processor {
|
|
return &Processor{
|
|
keyCache: make(map[string]ExpandedAppStateKeys),
|
|
Store: store,
|
|
Log: log,
|
|
}
|
|
}
|
|
|
|
type ExpandedAppStateKeys struct {
|
|
Index []byte
|
|
ValueEncryption []byte
|
|
ValueMAC []byte
|
|
SnapshotMAC []byte
|
|
PatchMAC []byte
|
|
}
|
|
|
|
func expandAppStateKeys(keyData []byte) (keys ExpandedAppStateKeys) {
|
|
appStateKeyExpanded := hkdfutil.SHA256(keyData, nil, []byte("WhatsApp Mutation Keys"), 160)
|
|
return ExpandedAppStateKeys{appStateKeyExpanded[0:32], appStateKeyExpanded[32:64], appStateKeyExpanded[64:96], appStateKeyExpanded[96:128], appStateKeyExpanded[128:160]}
|
|
}
|
|
|
|
func (proc *Processor) getAppStateKey(keyID []byte) (keys ExpandedAppStateKeys, err error) {
|
|
keyCacheID := base64.RawStdEncoding.EncodeToString(keyID)
|
|
var ok bool
|
|
|
|
proc.keyCacheLock.Lock()
|
|
defer proc.keyCacheLock.Unlock()
|
|
|
|
keys, ok = proc.keyCache[keyCacheID]
|
|
if !ok {
|
|
var keyData *store.AppStateSyncKey
|
|
keyData, err = proc.Store.AppStateKeys.GetAppStateSyncKey(keyID)
|
|
if keyData != nil {
|
|
keys = expandAppStateKeys(keyData.Data)
|
|
proc.keyCache[keyCacheID] = keys
|
|
} else if err == nil {
|
|
err = ErrKeyNotFound
|
|
}
|
|
}
|
|
return
|
|
}
|